Heat will eventally wear the protection that is on the metal & corrosion will apear if your driving in wet conditions & salt(sand) even worse. But if your in a clean state, you'd be OK 4 a little bit, but I'd still want top coat protection preferrably clearcoat cause it controls all elements very well. The more the better, 4 clear atleast.Color is color. Clear is protection. Don't get me wrong, it has to be primed properly 4 that foundation & 3 coats of cleAR is sufficient 4 bay.